added slots to the simple cpu

src/simudator/processor/simple/simple.py

@@ -15,6 +15,8 @@ class SIMPLE_CPU(Processor):
     This cpu is made to test core modules and module graphics items for these modules.
     """
 
+    __slots__ = ()
+
     def __init__(self) -> None:
         super().__init__()
         # Creating all signals